I'm working my way thru the electrical system cleaning grounds, light sockets, replacing corroded connections, trying to fix a ground fault in the system that is apparently somewhere between the drivers headlight and turn signal. At least, that's where I see the effects. No luck so far but I have a few more to do still. In the mean time, I am trying to identify a part so I can replace it, I'll post a pic at the end.
Its a small circuit board, about 2 x 11/2 inches. It comes off of the rear lighting wire bundle. It's mounted on the outside of the truck, beside the brake and back up lights.
This is on a 1984 Chevy G30 box truck. Any help identifying this part will be appreciated, as I cant replace it until I can name it.
Thanks,
Chuck
1984 Chevy G30 Box truck

 

Where do the wires go ,that were hooked to it?

 

they went to the rear light wiring bundle. Not sure if it was powered by the brakes, turn signal or back up lights.

 

Could be a backup alarm. Take the wires that were connected to it and check when there is voltage there. If there is voltage when it is in reverse then it is a backup alarm.

 

Oh, good answer Old Chevy. I'll try that, thanks.
But if there is a beeper unit somewhere it is well hidden!